"Amino acids are the monomers that make up proteins. All proteins are made up of different arrangements of the same 20 amino acids."
https://rwu.pressbooks.pub/bio103/chapter/amino-acids-and-proteins/
"the antigen to which the immune system responds is a relatively small number of amino acids or peptide."
https://www.who.int/teams/health-product-policy-and-standards/standards-and-specifications/vaccine-standardization/synthetic-peptide-vaccines
"Synthetic peptide immunogens have been shown to elicit antibodies that can react with full-length proteins containing that peptide."
https://pubmed.ncbi.nlm.nih.gov/6357058/
"Antibodies are proteins made by the immune system in response to an infection or vaccination"
https://www.verywellhealth.com/antibodies-from-vaccines-and-from-natural-infection-5092564
"Synthetic antibody libraries are developed using designed synthetic DNA that enables highly optimized human frameworks and introduces defined chemical diversity to prevent highly likely to recognize antigens. Using a simple design based on a single human framework that restricts diversity to four complementarity-determining positions and two amino acids(tyrosine and serine), synthetic antibody libraries can create particular antibodies against various protein antigens.
Moreover, a more complex synthetic antibody library can be developed to produce antibodies with high affinities and specificities beyond natural antibodies capacity."
https://www.ieyenews.com/natural-and-synthetic-antibodies-know-the-difference/
"Antibodies that recognize intact proteins can be produced through the use of synthetic peptides based on short stretches of the protein sequence, without first having to isolate the protein."
https://pubmed.ncbi.nlm.nih.gov/18265297/
"Synthetic antibodies can be used in all applications where traditional monoclonal or polyclonal antibodies are used and offer many inherent advantages over animal-derived antibodies, including comparatively low production costs, reagent reproducibility and increased affinity, specificity and stability across a range of experimental conditions.[3]"
https://en.wikipedia.org/wiki/Synthetic_antibody
Synthetic antibodies might offer a quick coronavirus treatment
https://news.yahoo.com/synthetic-antibodies-might-offer-a-quick-coronavirus-treatment-132122036.html